Abstract: A spray booth for use in the spray coating of articles with coating powder. The spray booth forms a coating space which at a bottom is bounded by powder collection means. The powder collection means is divided into an inner collection means and a surrounding outer collection means for the separate collection of surplus powder and the separate removal of the entire surplus powder from the booth. The outer collection means collects surplus coating powder dropping off the inside surfaces of the booth walls. Since this powder may be contaminated with different color or different types of powder from previous spraying operations, it is discarded as waste. The inner collection means collects pure surplus powder which has not touched the booth wall surfaces. This pure surplus powder is recycled.

Abstract: A food breading apparatus for breading food components with a breading mixture includes a breading drum rotatable about its longitudinal axis wherein the longitudinal axis is inclined from horizontal. The drum includes an inlet opening located in an upper end, an outlet opening located in a lower end, and a plurality of openings located proximal to the lower end of a sidewall. The openings are sized to allow surplus breading mixture and lumps of breading mixture to pass therethrough but retain the breaded food product in the rotating breading drum. An inlet conveyor provides food components to be breaded to the inlet opening of the breading drum. A recirculating breading mixture conveyor provides the breading mixture to the inlet opening. A takeout conveyor moves the breaded food components from the outlet opening of the breading drum. A lump removal conveyor is positioned below the plurality of openings in the sidewall of the breading drum.

Abstract: A plate which is adjustable is positioned in an apparatus for coating a foodstuff with particulate material to control an amount of particulate material falling from a first belt of a conveyor to an inclined portion of a second belt of the conveyor beneath the first belt. To control the amount of material, the plate is positioned below a horizontal run of the first belt and above the inclined portion of the second belt. The material deposited on the inclined portion of the second belt is conveyed to a horizontal upper run of the second belt and provides a layer of material for coating a foodstuff transported from the horizontal upper run of the first belt to the horizontal upper run of the second belt.

Abstract: An apparatus and method for applying a resin coating to a plurality of discrete portions of a fastener, such as both internal and external threads. A conveyor supports a fastener. The fastener is first transported past a heater and then past a first powdered resin spray assembly. Powdered resin, supplied to the first spray assembly by a resin reservoir, is used to generate a first air-borne powdered resin stream which coats one set of threads with resin when the fastener traverses the resin stream.The conveyor also transports a second resin spray assembly through the first air-borne powdered resin stream. The second spray assembly uses a resin receiver to aspirate the air-borne resin. The resin is then used to generate a second powdered resin stream which coats the other set of fastener threads.

Abstract: An apparatus and method for utilizing and controlling finer particles in a powder coating system returns the finer particles to the spraying apparatus to be sprayed on parts by the system. Finer particles are continuously removed from the system by application onto parts, and the accumulation of fines is thereby prevented. The finer particles may be sprayed through specially adapted spray guns, which also permits the utilization of the special advantages of spraying fine powder materials. By removing fine powder particles from the system before they build up, the present invention improves the powder coating operation in various respects.

Abstract: Plant for the powdered-paint spraying of pieces to be painted, comprising a spraying booth with replaceable walls of the disposable type and a unit for feeding and recovering the paint that has not deposited on the pieces to be painted. The booth comprises a supporting frame which delimits a spraying chamber having at least two walls or half-booths which are arranged mutually opposite, have replaceable sheets and are movably mounted with respect to one another for moving mutually closer and further apart to vary the section of the spraying chamber according to the width of the pieces to be painted.

Abstract: Packaging and/or storing atactic polypropylene or other amorphous poly alpha olefins is accomplished by first heating a mass of the olefin material to a molten state and then cooling the molten mass of olefin material to an extrusion temperature. Next, the formless mass of atactic polypropylene is extruded and cut into a succession of pellets. Inert dust-like material is sprayed onto the cutting surfaces and the surface of the olefin material so that the natural tendency of the material to stick to itself and to other objects is avoided.

Abstract: A powder coating booth and a recirculating air system is provided for electrostatic coating of articles. The booth includes an operator compartment and a spray chamber. A recirculating fan supplies air to the operator compartment which passes through a window into the spray chamber. The fan also provides air flow through orifice plates at the top of the spray chamber to surround the articles in a controlled manner. The fan additionally supplies air against the back wall of the spray chamber. All of the air in the spray chamber is passed through a reclamation filter and back to the fan. The entire system can be provided on a mobile base.

Abstract: This invention reduces the air pollution associated with spraying of paints, coatings, solvents or pesticides against a surface. Spraying invariable causes bounceback of sprayed solids as well as overspray consisting of bounceback and an aerosol of solids, solvent, and air and is an important source of air pollution. This invention is a resprayer consisting of a jet venturi induction pump located near the front of a spray gun which captures the overspray and a respray nozzle which redeposits the captured material on the work surface.

Abstract: An apparatus and method for applying particulate powder material to a moving fibrous substrate includes a volumetric dry material feeder for forming a continuous stream of particulate powder material. The continuous stream is then transmitted through a nozzle and exits at an outlet thereof. The nozzle is movable between a first and second position by a motion control. The motion control includes an adjustable differential gear box and an encoder for synchronizing the dispensing of powder at a predetermined location of the substrate. A flow separator is disposed beyond the outlet of the nozzle and intermediate of the first and second positions. In operation, the motion input drives the nozzle to oscillate between the first and second positions at a variable speed over each product cycle. As the nozzle crosses a plane of the flow separator, the continuous stream of particulate powder material exiting the nozzle is split into two intermittent streams of particulate powder material.

Abstract: Apparatus and continuous process for impregnating fibers with polymer powders in which the fibers are caused to circulate in an aerosol passed through a fluidized bed contained in an earthed fluidization vessel. The particles constituting the fluidized bed are chosen so as to charge the powder particles electrostatically. The aerosol is continuously fed with a flow of fresh powder particles equal to that at which it is desired to impregnate the fibers per unit time and all the powder particles previously introduced which have not been impregnated into the fibers are continuously reintroduced into the fluidized bed without any change in the supply flow rate of fresh powder particles.

Abstract: An electrostatic powder spray coating system for car bodies is disclosed. Above the car bodies (14) are moved through the cabin and from which the spray organs (94) are supplied with powder. The powder container (92) is supplied with fresh powder and recycled powder from a supply container (36). Short paths between the powder container and spray organs allow precise metering and therefore a good coating quality. The spray coating is applied within an arrangement of inner and outer cabins which allows pressurizing of space between the cabins to prevent ingress of atmospheric air into and egress of powder out of the system.

Abstract: The invention concerns an apparatus and process for making foods coated in bread crumbs.The apparatus has a crumbing apparatus for converting loaves, of bread into breadcrumbs; a coating location whereto fresh crumbs are delivered from the crumbing apparatus; and a conveyor for transporting substrate food to the coating location for coating with the crumbs and for transporting coated food away from the coating location.The process involves the steps of obtaining baked and staled bread; inserting the bread into an apparatus which converts the bread into crumbs and substantially immediately coats the crumbs onto a substrate food. For conversion into crumbs, bread is supported on rods over a rotating drum having teeth which project between the rods to engage the bread. Thus bread too moist for grinding can be crumbed.

Abstract: A method of producing a particulate-solid-bearing air-permeable sheet of material of other than woven and knitted material selected from non-woven fabrics and open cell foam materials includes the following steps: entraining a particulate solid in a gaseous carrier in the substantial absence of fibrous material; disposing one face of a preformed air-permeable sheet material, which material has a density at or below 0.25 g/cm.sup.3, in the path of a stream of the gaseous carrier and entrained particulate solid, whilst maintaining a pressure drop across the thickness of the preformed air-permeable sheet material from the one face to the other face of the air-permeable sheet material, whereby to entrap some or all of the entrained particulate solid on or on and in the air-permeable material; and fixing the retained particulate solid on or on and in the air-permeable material with a binder. The mean pore size of the preformed sheet material is greater than the mean particle size of the particulate solid.

Abstract: An electrostatic powder coating apparatus comprising a powder reservoir, a gas flow injection chamber, a diffusion chamber and a coating chamber and method for coating a substrate or target objects. The injection chamber receives powder from the reservoir at a controlled rate. The powder particulates are entrained by a gas flow within the injection chamber. The diffusion chamber receives the particulates from the injection chamber. The diffusion chamber deaccelerates the particulates and creates a particulate cloud. The coating chamber receives the particulate cloud. A housing encloses the coating chamber. The coating chamber is isolated from the ambient atmosphere. The coating chamber has a cloud inlet and a cloud outlet. The cloud flows through the coating chamber from the inlet to the outlet. One or more deflectors, within the chamber, define a passage and two or more pockets adjoining the substrate or target objects.

Abstract: An apparatus that can recover excess paint powder that is blown onto workpieces by a spray gun. The apparatus has a first duct that is placed near the workpiece across from the spray gun. The first duct is preferably constructed as a collapsible tent that can be hung by a ceiling fixture. The tent extends along the length of any workpiece, to insure that all of the powder is collected. The tent can be attached by merely pulling a cable and hooking the top of the tent to the ceiling fixture. Connected to the duct is a fan that draws air from the area around the workpieces into the duct. The fan and duct are constructed so that all of the excess paint powder is removed from the paint area. The duct has an inner cavity that directs the paint powder to a filter that captures the powder so that the paint can be reused.

Abstract: An apparatus and method for coating surfaces of workpieces employs an electrostatic fluidized bed unit for producing a cloud of charged particles, for deposition upon the workpiece, and a second fluidized bed for agitating the particulate material and for facilitating feeding thereof to the electrostatic coating bed, the second bed being disposed beneath the first bed, and being in powder flow communication with it.

Abstract: This invention provides a cost effective, simple and sanitary breading machine suitable for coating a variety of food products, such as poultry, with different types of breading materials. After coating of upper and lower surfaces of food products introduced into the breading machine, a significant dwell time within the breading machine is achieved in the construction to allow breading material to more effectively set up on the coated food products. The coating machine further includes structure to enable the food products introduced therein to be flipped a plurality of times, wherein additional coating material is continuously applied to alternate sides of the food products and desirable coating characteristics are achieved.

Abstract: An apparatus for coating a foodstuff with a particulate material has an endless meshed conveyor belt which is trained about a hollowed roller which has a longitudinally extending wall having apertures therethrough and about which the belt travels from a lower return run to an upper forward run. A baffle is positioned beneath at least a portion of the lower return run of the belt and is arced from the lower return belt run towards the upper forward belt run. A rotatable shaft from which radial wings protrude is positioned within the hollowed roller interior.

Abstract: A pulverulent coating material application and reclaiming system comprises a booth including a floor, a pair of opposed side walls and a pair of opposed ends. Articles to be coated are conveyed through the booth between the walls and above the floor for coating by the pulverulent material. A dispenser dispenses pulverulent material onto the articles as they are conveyed through the booth. A receptacle is provided under the floor for reclaiming pulverulent material which does not adhere to the articles. The floor terminates short of ends of the booth to define adjacent to the ends entries to the receptacle for reclaimed pulverulent material. A floor wiping mechanism includes a wiper, low friction mountings on the wiper to permit low friction movement of the wiper on the floor, scraping blades mounted on the wiper in contact with the floor, and a prime mover for reciprocating the wiper at intervals lengthwise of the floor to return pulverulent material accumulated on the floor therefrom into the entries.

Abstract: Particulate material for coating foodstuffs falling from a belt of a conveyor within a rotatable drum is distributed substantially evenly over the interior wall of the drum by a guiding device which includes at least one movable plate which is positioned below the belt and which has a longitudinal axis parallel to the end of the belt. The particulate material distributed from the belt to the drum is conveyed by the drum to a conveyor which delivers particulate coating material to a foodstuff to be coated.

Abstract: A facing material spray apparatus including a first tank for housing a facing material and regulating its concentration, first agitating means for agitating the facing material in the first tank, a second tank, for receiving the facing material from the first tank, provided in the vicinity of the first tank with its bottom positioned below the bottom of the first tank, second agitating means for agitating the facing material in the second tank, a connecting pipe for connecting the first and second tanks to each other and causing the facing material in the first tank to naturally flow into the second tank, a valve attached to the connecting pipe for opening and closing a facing material supply passage, a facing pump removably attached to the second tank for sucking the facing material in the second tank, a nozzle attached to the facing pump through a hose for spraying the sucked facing material on a mold, and a facing material receiving base provided in the vicinity of the second tank for receiving the facing

Abstract: Apparatus for applying powdered coating to a workpiece--particularly to electric motor armatures and stators--including features relating to handling and masking of workpieces before, during and after coating, is provided. A first feature of the invention is the inclusion of all coating steps--e.g., coating, cleaning and precuring--as modules in a single treatment station on the production line. The treatment station can also be enclosed in a single housing to contain excess powder from both the coating and cleaning processes, so that a single powder recovery system can be used to recover the excess powder from both processes. The invention also includes a handling system for removing the workpiece from the production line, inserting it into the treatment station and moving it past the various modules in the treatment station, withdrawing it from the treatment station, and returning it to the armature production line.

Abstract: A method and apparatus for spraying a solid particulate powder onto the interior surface of tubular articles by intermittently pumping the powder from a fluidized bed of powder through a powder supply line containing an intermittently operated venturi pump and air amplifier, as well as a pair of constantly operated air diffusers and an electrostatic charging apparatus. A powder collection shroud adjacent at least one open end of the tubular article has a carefully regulated vacuum applied thereto in order to collect oversprayed powders.

Abstract: A method and an apparatus for electrostatic coating of workpieces with powdered material includes a plurality of successively arranged spray guns which are passed by the workpieces. At least the spray gun which is passed first by the workpieces is charged with recycled powder while at least the spray gun which is passed last by the workpieces is charged with fresh powder in form of a powder-air mixture containing a low amount of air and supplied at low velocity.

Abstract: A powder coating system particularly adapted for coating large objects such as automotive and other vehicle bodies comprises a spray booth having a manual/robotic spraying area for the application of powder to the inner door flanges and other hard to reach areas of the vehicle body using manually or rotatably operated powder dispensers, and an automatic spraying area wherein the remainder of the vehicle body is coated using automatically manipulated powder dispensers. A powder collection and recovery system is associated with the spray booth which includes removable cartridge filters arranged in V-shaped filter banks within powder collection chambers beneath the floor of the booth, a system for the transfer of powder collected in the powder collection chambers to hoppers located exteriorly of the booth and an air exhaust system for equalizing the negative pressure within clean air chambers which receive clean air after filtering by the cartridge filters.

Abstract: A self contained recirculating powdering and vacuuming assembly and the airflow discharge manifold therfor. The vacuum assembly includes a blower operably connected within a housing having a low and high pressure region. A powder tray is mounted beneath a first outlet at the bottom of the low pressure region and is structured to hold a quantity of powder for controlled depositing onto paper stock having a wet ink coating on preselected areas of the paper stock. This first outlet sealably transfers powder collected in the low pressure region back into the powder tray, which powder is transported by conveyor beneath the powder tray. A vacuum passage extends downward from a low pressure region inlet to a powder pickup slot positioned adjacent to the area where the powder is deposited onto the paper stock. Pressurized air is directed toward the pickup slot from either side thereof by the airflow discharge manifold which receives air from the high pressure region outlet.

Abstract: A system for applying one or more coats to the top and/or bottom of strips of backing and for manufacturing strip without any strips of backing. The system is has a water-cooled belt (17), at least one separate coater (9, 22, 23, and 35) for the upper and lower surfaces, separate sprinklers (12 and 25) for sprinkling the coated upper and lower surfaces of the strips of backing, featuring suction devices (13 and 26) for suctioning up any dust from the water-cooled belt and at least one additional coater (42) and water-cooled roller (67) is provided for coating strips of backing or for manufacturing a strip without the strips of backing.

Abstract: An apparatus for applying a coating of solid particulate powder to the interior surface of tubular, cylindrical articles includes a conveyor for transporting the articles to and from a powder spray station whereat powder is sprayed into one open end of the articles. The conveyor includes an endless belt conveyor movable in a direction perpendicular to the spray from the nozzle and the axes of articles supported on the conveyor. The articles are supported on the conveyor by lugs in the form of rollers which support the articles in grooves defined between adjacent pairs of lugs.

Abstract: A process for forming a thermoplastic resin coating on glass fibers comprises heating a thermoplastic resin powder until molten and applying it to the glass fibers. The coated fibers can then be heated and drawn into a desired shape which also removes resin. Then the coated fibers are cooled to make a preform. The coated fiber preform can then be molded. Several resin layers with glass fibers of varying lengths can be deposited to make a graded preform. Apparatus for forming a thermoplastic resin on glass fibers sprays hot thermoplastic powder on the glass fibers. The coated fibers can then be heated such as by IR lamps and then drawn through a die which has a spigot to remove excess plastic. Alternately, a plurality of plastic and glass fiber layers can be deposited on a veil.

Abstract: An apparatus for coating an article on both sides with a continuous layer of granular flowable material of constant thickness. The apparatus includes a belt for transporting the articles, with the material being capable of passing through the belt. The belt further includes an uppermost run and a lowermost run, with guide plates positioned beneath the uppermost and lowermost runs, with the material and the belt capable of being moved over the guide plates. The lowermost run of the belt is twice oppositely guided downward in the direction of the belt's movement to form three belt sections in the lowermost run. The three belt sections further include a first belt section, a second belt section positioned beneath the first belt section, and a third belt section positioned beneath the second belt section.

Abstract: Apparatus for collecting and drying powder used for electrostatic coating of a workpiece has air injection means incorporated into the collection bin both to dry and also to homogenize powder recovered, just prior to withdrawal from the bin.

Abstract: An apparatus for producing a black matrix-type phosphor screen of a cathode ray tube is disclosed, which includes a carbon coating nozzle for coating a carbon slurry on a cathode ray tube panel, a tank for containing the carbon slurry, a supplying system for supplying the carbon slurry from the carbon slurry tank into the carbon coating nozzle and a collecting system for collecting excess carbon slurry produced from the carbon coating nozzle back into the carbon slurry tank, and a carbon slurry regenerating device using an ion-exchange resin is provided. The regenerating device can be placed in at least one of the supplying system, the collecting system and the carbon slurry tank.

Abstract: In a powder coating facility wherein powder entrained with conditioned air sprayed from a feed conduit (11) to a workpiece, such as a can body (51), and excess powder is returned by suction by means of exhausts (29, 25), a conditioning chamber (21) is arranged around the coating zone (15) in order to prevent contamination of the dispensed powder due to influences of the enviroment (U). An air flow (S) is provided, produced from openings (23) of the chamber (21), to conduct the can bodies (51) into and through the chamber (21). The air flow from the openings of the chamber prevents influences of the ambient surroundings of the chamber powder sprayed and retrieved in the powder coating facility.

Abstract: A breading machine is provided in which the breading recirculation system enables effective circulation of excess breading through the machine to be reused for dispending the breading material onto the surfaces of a food product. The circulation system distributes a variety of breading materials more efficiently so as to avoid congestion or build up of the breading materials within the machine which has previously required cleaning or other functions to be performed. The circulation system provides direct auger-to-auger coupling at transition zones between various breading transporting screws within the machine. Further, appropriately positioned discharge chutes are provided to enable some types of breading materials to be transferred at the transition zones without damaging the breading materials. The circulation system is also completely contained so as to be safe and effective in its operation and yet is easily cleanable to maintain sanitary conditions.

Abstract: The invention describes a coating machine which includes an endless pervious conveyor belt supported in an elongated frame which provides a food product conveyance path within the machine. A hopper is disposed above the food product conveyance path in which an amount of a coating material is provided to generate a falling curtain of bread crumbs or the like to cover the top and sides of food product pieces passing along the food product conveyance path. The machine also preferably includes a circular drum type conveyor which is rotatably supported along the elongated frame adjacent the hopper and includes a plurality of pockets formed therein which open into the interior of the machine and the hopper. Conveyors are provided in both the elongated frame and hopper to distribute coating material from the frame enclosure to the circular conveyor which will in turn distribute coating material to the hopper to generate the upper layer of breading material.

Abstract: Apparatus for applying a fusible granular precursor of a protective and/or decorative coating to the surface of an article. The apparatus includes a dispenser for dispensing a stream of the fusible granular precursor in a stream of a bearing fluid, a recovery mechanism for recovering fusible granular precursor that does not adhere to the surface of the article, and mounting hardware for mounting the dispenser within the recovery mechanism. The recovery mechanism is coupled to a reclaim facility for reclaiming fusible granular precursor recovered by the recovery mechanism. The recovery mechanism includes first and second manifolds, a blower for establishing subambient pressures in the first and second manifolds, a first series of inlets generally surrounding the dispenser and coupled to the first manifold, and a second series of inlets coupled to the second manifold.

Abstract: A method and apparatus for spraying a solid particulate powder onto the interior surface of tubular articles by intermittently pumping the powder from a fluidized bed of powder through a powder supply line containing an intermittently operated venturi pump and air amplifier, as well as a pair of constantly operated air diffusers and an electrostatic charging apparatus. A powder collection shroud adjacent at least one open end of the tubular article has a carefully regulated vacuum applied thereto in order to collect oversprayed powders.

Abstract: A method for providing a metal substrate with an impact resistant surface is disclosed. The surface of the substrate is exposed to high intensity laser radiation to melt a spot of the surface. Particles of a material such as WC are injected into the melt.In order to enhance the percentage of particles in the surface, thus increasing the wear resistance, there is a forced reflection of stray particles back toward the melted spot.Further a fixture for holding the substrate, comprising the essential reflection surfaces for achieving the desired back reflection is described as well as a device for carrying out the method.

Abstract: A breading machine incorporating the present invention for use with fresh or green bread crumbs for continuously coating a battered food product having a frame supporting an endless conveyor on which food product is disposed defining a food product conveyance path, and a rotatable drum type conveyor disposed adjacent to the path and operable to receive fresh bread crumbs and to convey the bread crumbs into a hopper for distribution to the food product conveyor for coating the food product carried thereon.

Abstract: The invention relates to coating a heated substrate, particularly glass, by a process according to which a distribution nozzle ending in a slot, sprays a gas stream mixed with a pulverulent or powder product, which decomposes in heat, onto a heated substrate for contact therewith to form a thin coating layer thereupon. The coating zone in the vicinity of the main stream of gas-entrained powder coming from the nozzle is cooled to prevent premature decomposition and to directly remove pulverulent products not immediately deposited upon the substrate. Also, a device for carrying out the novel process is disclosed herein. The invention makes it possible to produce a coated glass substrate which is essentially free of the problem of coating fogging.

Abstract: A stream of molten metal is atomized to form a spray and additional cooling is achieved by applying to the stream or spray relatively cold solid particles. The solid particles are preferably injected into the spray and may be formed from overspray particles recycled from the deposition process.

Abstract: A booth for applying a powdered coating to the surfaces of workpieces in which a clean gas zone is joined to the coating zone via the rear wall, which is connected to an extractor fan. Located in a recess of the rear wall is a frame-like structure, the outer frame of which is split up into individual areas by means of frame cross-members each area receiving a filter element, which is housed in an interchangeable cassette, and consisting of a continuous zig-zag shaped or wave-shaped surface-membrane filter strip. Each area of the frame is covered in a leak-proof manner by a protective hood in hood space in an oblique manner towards the coating zone and detach the excess powder attached to the membrane applied thereon, which is diverted through a slat-type screen down to the floor of the booth and into a powder container. Thorough cleaning can be effected by a second cleaning device arranged in the coating zone or after removal of an interchangeable cassette from the booth.

Abstract: A granule application device for use in making a shingle roofing product is provided. This device includes a sheet having a weather protected headlap area and having a weather exposed butt area which moves continuously from an upstream end to a downstream end. The device includes a blender applicator which dispenses blended butt granules on the sticky, asphalt treated, upper surface of the sheet for covering the butt area only. The device also includes a headlap applicator which dispenses less expensive headlap granules on the headlap area only. The device also includes a recycle applicator, which dispenses recycle granules over the blended granules on the butt area only, and dispenses scrap granules over the headlap area only. The moving sheet is supported on a talc drum and a slate drum near the downstream end, and is supported on a back roll near the upstream end thereof.

Abstract: An apparatus and method for applying locking material to an area of a fastener adapted for internal threading. The apparatus includes a support structure for moving a succession of internally threadable fasteners with support structure recesses positioning the fasteners for treatment. The fastener opening is filled with locking material and the fastener heated to soften the locking material and cause adherence to the internal walls of the fastener. A clearance pin can be used to selectively clear a passageway through the locking material either before or after the heating step. A gas pressure source directs a gas stream toward the opening of the fastener to form a passageway through the locking material attached to the fastener.

Abstract: The present invention is directed towards a method and apparatus for treating materials consisting of a plurality of monofiliments with a treating agent. The treating agent is suspended in streams which are directed to the material from various directions and under a controllable pressure so as to separate the monofiliments and thereby expose the individual monofiliments to the treating agent. The streams of treating agent are directed to the material with application of the Venturi principle. The streams of treating agent may be applied in a reciprocating manner.

Abstract: A method and apparatus for pumping a steady flow of powder from a powder spray gun of a powder spray system by pumping the powder from a fluidized bed feed hopper to the spray gun via a small auxiliary fluidized bed hopper located in close proximity to the powder spray gun. The apparatus comprises a primary fluidized bed hopper into which reclaimed powder is supplied from a powder spray booth via a powder filter module and a sieve. Powder from the primary feed hopper is pumped to the gun via an auxiliary and much smaller capacity auxiliary fluidized bed hopper located in relative close proximity to the spray gun.

Abstract: The invention relates to the process and apparatus coating of a substrate, particularly a glass ribbon, with a pulverulent product. The invention proposes the implementation of a distribution nozzle (10, 24) that sprays the pulverulent product in suspension in a gas, and a suction device (14) for evacuating the resultant waste of the decomposition of the pulverulent product from a coating zone (Z). The invention concerns the formation of at least one to extend the residence time of the pulverulent product in the coating zone to facilitate its deposit on the substrate. The invention also concerns the production of substrates, particularly glazings, coated with metal oxides.

Abstract: A method of powder coating the inside of tubular goods, such as oilfield pipe and the like, by connecting one end of the pipe to a means for producing a flow of compressible gases therethrough. The other end of the pipe is open to atmospheric pressure. A valve means is connected for controlling the flow of air through the container which holds a single charge of plastic powder. The charge of powdered plastic is isolated upstream of the pipe inlet. The charge is of sufficient size to coat the entire inside peripheral wall surface of the pipe with a substantial uniform coating of plastic. The pipe is heated above the softening temperature of the plastic and axially rotated, so that when the valve is opened, air flows through the container, into the pipe, and establishes a pressure gradient across the entire length of the pipe. This action causes the captured charge of plastic to form a pocket of dispersed plastic particles which is forced to flow through the pipe by the air flow.

Abstract: A method of powder coating the inside of tubular goods, such as oil field pipe and the like, by connecting one end of the pipe to a means for producing a flow of compressible gases therethrough. The other end of the pipe is open to atmospheric pressure. A valve means is connected upstream of the pipe between the inlet end thereof and a container for holding a single charge of plastic powder. The charge of powdered plastic is isolated upstream of the pipe inlet. The charge is of sufficient size to coat the entire inside peripheral wall surface of the pipe with a substantial uniform coating of plastic.